What does code P0405 mean?

P0405 — Low input from EGR position sensor. ECM isn't getting actual feedback on valve position. Belongs to the powertrain.emission system. Severity: warning.

What are the common causes of P0405?

Break in EGR position sensor signal wire; Signal shorted to ground; Internal open in the sensor; Damaged connector or corrosion; Worn resistive track in the position sensor

Can I drive with code P0405?

Limited: reaching the nearest workshop is fine, but avoid long trips. May progress into a more serious fault.

How do I diagnose P0405?

Read the code and freeze-frame with a scanner, check related-system errors, inspect the components listed (wiring, connectors, sensors). See the "How to diagnose" section above for the full step-by-step.

How do I clear code P0405?

The code can be cleared via an OBD-II scanner (e.g. ELM327 + the Car Diagnostics app): plug the adapter into the OBD port, go to Errors → Clear. If the underlying cause isn't fixed, the code will return within a few drive cycles.

OBD-II Code P0405 — Car Diagnostics Platform

What it means

Common causes

Break in EGR position sensor signal wire
Signal shorted to ground
Internal open in the sensor
Damaged connector or corrosion
Worn resistive track in the position sensor
Faulty ECM — less common

How to diagnose

01
Read all stored and pending codes with an OBD-II adapter — get the full picture, not just the one code.
02
Capture freeze-frame data (RPM, coolant temperature, engine load) at the exact moment the code triggered.
03
Inspect the named subsystem with our app's AI explanation — get vehicle-specific causes for your make, model and year.

Decode P0405 on your actual car

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